Add 512K of external SRAM to Arduino Mega. Part 1 - Theory
Getting Started with Arduino – Beginner's Tutorial to Open-Source Hardware Prototyping with Arduino Uno - CIRCUITSTATE Electronics
Arduino Atto Board with 2 KB RAM, 3.3 V operating voltage. | Download Scientific Diagram
Pzsmocn Onboard Voltage Translator,External RAM,Micro SD Slot,Universal e-Paper Raw Panel Driver Shield for Arduino/NUCLEO.Can be Used to Drive Various SPI Interface e-Paper. : Amazon.co.uk: Computers & Accessories